Cartridge case trimmer-grinder



Jun@ Q l W|LSQN CARTRIDGE CASE TRIMMER *GR INDER Filed Oct. '7, 1964 INVENTOR. Caz/"i119 L. Uf/aora BWM .X0/m'.

Wi 252% www EM 3,324,600 CARTRIDGE CASFJ TRlMMER-GRINDER Curtis L. Wilson, Box 1094, Sierra Vista, Ariz. 85635 Filed Oct. 7, 1964, Ser. No. 402,363 1 Claim. (Cl. 51-74) ABSTRACT F THE DISCLOSURE A cartridge case trimmer-grinder in which an elongated bar, carrying a detchable, longitudinally grooved insert, is pivoted at one end to a support and to a threaded bolt at its other end for adjustment relative to a grinding wheel. Spring biased longitudinally aligned cartridge cases in the insert groove are fed under the grinding wheel by a spring-loaded follower. A pointer integral with the bar registers with indicia on an arcuate edge of the support.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a cartridge case trimmer and grinder which trims ammunition cartridge cases quickly, easily and accurately.

The present invention is designed to replace existing cartridge case trimmers and especially hand operated trimmers and which utilizes a grinding wheel instead of a cutter, the device being adjustable in order to accommodate many sizes and lengths of cases. An adjustable carrier rail having a spring-biased follower which is operated by a handle and an adjusting screw, permits cartridge cases of different sizes to be fed under a grinding wheel.

It is a prime object of this invention to provide a cartridge case trimmer that utilizes a grinding wheel instead of a cutter.

Another object is to provide a trimmer that is adjustable for the accommodation of cases of different lengths.

Another object is to provide a trimmer for cartridge cases that will trim a large quantity of cases speedily and accurately.

A further object is to provide a trimmer having a great durability and saving the expense of replacing cutters by utilizing a grinding wheel.

A still further object is to provide a cartridge case trimmer operable by a single operator.

A final object of this invention is to provide a cartridge case trimmer that will permit the high speed trimming of cartridge cases on a volume basis, while keeping the length of the finished case within extremely accurate limits of tolerance.

The specific nature of the invention as well as other objects and advantages thereof, will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

FIGURE 1 is a side elevation of the cartridge case trimmer of this invention;

FIGURE 2 is an end view thereof; and

FIGURE 3 is a sectional detail taken along line 3 3 of FIGURE l.

Referring in detail to the drawing reference character 1 denotes, generally, the cartridge case trimmer of the invention.

A calibrated dial 2 having calibration indicia 3 along an arcuate edge 4 is provided and said dial also serves as a standard or support for the trimmer 1. A ange 5 integral with the lower end of dial 1 is provided with holes 6 so that the dial may be mounted on a bench or like support, not shown.

asalta Patented .lume 13, 1967 A grinding wheel 7 is mounted on dial 2 and is driven by a motor 8 on the opposite side of the dial through a shaft 9.

A carrier rail assembly indicated generally by 10 is pivoted to dial 2 as at 11. The carrier rail assembly 10 includes an elongated bar 12.

The forward end of bar 12 is provided with an integral pointer 13 which will follow the arcuate edge 4 of dial 2 when bar 12 is rotated to register with calibration indicia 3.

A follower rod 14 is slidably mounted in a guide 15. A stop 16 is provided on its rearward end and a coil spring 17 encircles rod 14 between the stop 16 and rod guide 15 and urges follower rod 14 towards the rear.

Rod 14 is further provided with a follower 18 having a linger grip portion 19 extending outwardly therefrom. Follower 18 is mounted on rod 14 by any suitable means, such as an integral collar portion 20 and secured by a setscrew 21 or like fastener.

Bar 12 is essentially U-shaped in cross section to provide a channel 22 which detachably receives an insert 23 therein and is secured therein by a set-screw 24. Insert 23 fits snugly within channel 22 and is provided with a passageway 25 extending throughout its length. Its top side is provided with an elongated groove 26 also extending throughout its length. Groove 26 and passageway 25 is for the accommodation of the rims of cartridge cases and the insert 23 may be exchanged for inserts having passageways and grooves of different width rirns for the accommodation of cartri-dge cases of different sizes.

Means are provided for the adjustment of the carrier rail assembly 10 relative to grinding wheel 7 and consists of an externally threaded bolt 27 which is rotatably secured at its upper end t-o dial 2 by an internally threaded bracket or like support 28.

Bolt 27 is pivotally mounted at its lower end to bar 12 of carrier rrail assembly 10 by a pivot pin 29. A knurled head 30 is provided on the upper end of lead screw 27 for turning by hand.

Cartridge cases are indicated in carrier rail assembly 10 (by broken lines) as at 31.

The operation of the device is relatively simple and is as follows:

(l) Select an insert 23 having a passageway 25 and Igroove 26 of the desired dimensions, to lit the cartridge cases 31 to be ground, and secure it into channel 22 in bar 12.

(2) Adjust the carrier rail assembly to obtain the desired distance between the grinding wheel 7 and the cartridge case to be ground by turning bolt 27.

(3) Start rotation of `grinding wheel 7.

(4) Pull back spring loaded follower rod 14 by finger grip 19.

(5) Insert the rims of several cartridge cases into passageway 25, sliding the cartridge cases 31 towards the grinding wheel 7.

(6) Let go of linger grip 19, thus allowing the follower 18 to push cartridges 31 forward in passageway 25 and under grinding wheel 7 whereby they will be quickly ground to the desired length and the ground cartridge cases will fall out of passageway 25. v

It will be readily apparent that the carrier rail assembly 10 can be made as long as is desired to accommodate larger quantities of cartridge cases.

The carrier rail assembly 10 can be set once and be used continuously until it is desired to change the insert 23.

Variations and modifications may be effected without departing from the scope of the novel concept of the present invention as set forth in the appended claim.

What is claimed is:

A cartridge case trimmer-grinder comprising in combination, a support dening an upstanding dial portion having an arcuate edge andk a mounting flange secured to its lower end, there being calibration indicia .along said arcuate edge; a power-driven grinding wheel mounted on said dial portion; an elongated bar having an integral pointer at one end thereof and adapted to extend over said indicia, its other end being pivoted to said dial p0rtion, there being an elongated channel in said bar; an insert detachably secured in said channeLsaid insert having a longitudinal passageway therein for slidably receiving the rims of a plurality of aligned cartridge cases; a spring biased follower carrie-d .by said bar for urging said cartridge cases in said passageway towards said grinding wheel; an externally threaded bolt having a head at one `of its ends and being pivotally connected at its other end to said bal adjacent said pointer, and an internally threaded bracket pivotally mounted to said dial portion and adapted to receive said bolt in threadable engagement whereby when said bolt is turned, said bar and said insert are moved relative to said grinding wheel and said pointer is moved along said indicia.

References Cited UNITED STATES PATENTS 1,277,472 9/1918 Pierce 51--74 1,626,015 `4/1927 Ullgren 241-282 2,570,302 10/1951 Anderson 51-74 2,652,243 9/1'953 Reed 51-240 X ROBERT C. RIORDON, Primary Examiner.

D. G. KELLY, Assistant Examiner. 

